Novel Regioselectivity: Three-Component Cascade Synthesis of Unsymmetrical 1,4- and 1,2-Dihydropyridines
作者:Jie-Ping Wan、Shi-Feng Gan、Gong-Lei Sun、Yuan-Jiang Pan
DOI:10.1021/jo900068z
日期:2009.4.3
of α,β-unsaturated aldehydes, amines, and enaminones proceeded smoothly to give 1,3,4-trisubstituted 1,4-dihydropyridines in aqueous DMF. Moreover, the unexpected regioselective formation of 1,2-dihydropyridines has been observed for the first time in such an approach. On the basis of a systematic study, the novel regioselectivity could be assigned both to steric and electronic effects originating from
α,β-不饱和醛,胺和烯胺酮的三组分顺序反应平稳进行,得到在DMF水溶液中的1,3,4-三取代的1,4-二氢吡啶。此外,在这种方法中首次观察到了1,2-二氢吡啶的意外的区域选择性形成。在系统研究的基础上,可以将新的区域选择性分配给源自胺配偶体的空间和电子效应。